Topology:
Use configuration from BGP task #3 as initial configuration for this task.
Requirements:
1. Configure new loopback interfaces on R8 :
loopback1, ipv4 address 1.0.1.1/32
loopback2, ipv4 address 2.0.2.2/32
loopback3, ipv4 address 3.0.3.3/32
loopback4, ipv4 address 4.0.4.4/32
2. Configure R8 to advertise the following prefixes to all eBGP neighbors:
8.0.0.0/16, 1.0.0.0/16, 2.0.0.0/16, 3.0.0.0/16, 4.0.0.0/16
Do not configure any new static routes on R8 to achieve this requirement.
3. Prefix 2.0.0.0/16 should have "origin" path attribute of "incomplete".
4, R8 should also advertise prefix 0.0.0.0/0 to AS67 and AS5. Do not configure any new static routes to achieve this requirement.
4, R8 should also advertise prefix 0.0.0.0/0 to AS67 and AS5. Do not configure any new static routes to achieve this requirement.
Solution:
Highlight the text below to reveal the solution.
This task requires understanding of BGP aggregation, including attribute maps and suppression.
Requirement #2 - since static routes are not allowed, install the loopback 1 - 4 adressess into BGP using redistribution or network command, then configure aggregation with suppress-map to filter out the /32 prefixes.
Requirement #3 - use attribute-map to set the required origin attribute on aggregate address.
Requirement #4 - use default-originate on R8 to neighbors.
This task requires understanding of BGP aggregation, including attribute maps and suppression.
Requirement #2 - since static routes are not allowed, install the loopback 1 - 4 adressess into BGP using redistribution or network command, then configure aggregation with suppress-map to filter out the /32 prefixes.
Requirement #3 - use attribute-map to set the required origin attribute on aggregate address.
Requirement #4 - use default-originate on R8 to neighbors.
R8:
!
route-map CONNECTED permit 100
match interface Loopback1 Loopback2 Loopback3 Loopback4
!
!
ip prefix-list LOOPBACKS seq 5 permit 1.0.1.1/32
ip prefix-list LOOPBACKS seq 10 permit 2.0.2.2/32
ip prefix-list LOOPBACKS seq 15 permit 3.0.3.3/32
ip prefix-list LOOPBACKS seq 20 permit 4.0.4.4/32
!
!
route-map SUPP permit 10
match ip address prefix-list LOOPBACKS
!
route-map ATTR permit 10
set origin incomplete
!
!
router bgp 8
bgp log-neighbor-changes
aggregate-address 2.0.0.0 255.255.0.0 attribute-map ATTR suppress-map SUPP
aggregate-address 4.0.0.0 255.255.0.0 suppress-map SUPP
aggregate-address 3.0.0.0 255.255.0.0 suppress-map SUPP
aggregate-address 1.0.0.0 255.255.0.0 suppress-map SUPP
redistribute connected route-map CONNECTED
redistribute static route-map STATIC
neighbor 8.0.58.5 remote-as 5
neighbor 8.0.58.5 password STRONG
neighbor 8.0.58.5 default-originate
neighbor 8.0.68.6 remote-as 67
neighbor 8.0.68.6 default-originate
neighbor 8.0.78.7 remote-as 67
neighbor 8.0.78.7 default-originate
!
Verification:
R8# sh ip bgp
BGP table version is 35, local router ID is 8.0.8.8
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
0.0.0.0 0.0.0.0 0 i
*> 1.0.0.0/16 0.0.0.0 32768 i
s> 1.0.1.1/32 0.0.0.0 0 32768 ?
*> 2.0.0.0/16 0.0.0.0 32768 ?
s> 2.0.2.2/32 0.0.0.0 0 32768 ?
*> 3.0.0.0/16 0.0.0.0 32768 i
s> 3.0.3.3/32 0.0.0.0 0 32768 ?
*> 4.0.0.0/16 0.0.0.0 32768 i
s> 4.0.4.4/32 0.0.0.0 0 32768 ?
*> 5.0.0.0/16 8.0.58.5 0 0 5 i
*> 8.0.0.0/16 0.0.0.0 0 32768 ?
* 12.0.0.0/16 8.0.78.7 0 67 12 i
*> 8.0.68.6 0 67 12 i
* 67.0.0.0/16 8.0.78.7 0 0 67 i
R8#sh ip bgp 1.0.1.1/32
BGP routing table entry for 1.0.1.1/32, version 33
Paths: (1 available, best #1, table default, Advertisements suppressed by an aggregate.)
Not advertised to any peer
Refresh Epoch 1
Local
0.0.0.0 from 0.0.0.0 (8.0.8.8)
Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best
RP/0/0/CPU0:R3#show bgp
Tue Dec 22 11:28:48.939 UTC
BGP router identifier 12.0.3.3, local AS number 12
BGP generic scan interval 60 secs
BGP table state: Active
Table ID: 0xe0000000 RD version: 152
BGP main routing table version 152
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i0.0.0.0/0 5.0.15.5 0 100 0 5 8 i
*> 67.0.36.6 0 67 8 i
* 67.0.37.7 0 67 8 i
* i1.0.0.0/16 5.0.15.5 0 100 0 5 8 i
*> 67.0.36.6 0 67 8 i
* 67.0.37.7 0 67 8 i
* i2.0.0.0/16 5.0.15.5 0 100 0 5 8 ?
*> 67.0.36.6 0 67 8 ?
* 67.0.37.7 0 67 8 ?
* i3.0.0.0/16 5.0.15.5 0 100 0 5 8 i
*> 67.0.36.6 0 67 8 i
* 67.0.37.7 0 67 8 i
* i4.0.0.0/16 5.0.15.5 0 100 0 5 8 i
*> 67.0.36.6 0 67 8 i
* 67.0.37.7 0 67 8 i
*>i5.0.0.0/16 5.0.15.5 0 100 0 5 i
* 67.0.36.6 0 67 8 5 i
* 67.0.37.7 0 67 8 5 i
* 8.0.0.0/16 67.0.36.6 200 0 67 8 ?
*> 67.0.37.7 300 0 67 8 ?
*>i12.0.0.0/16 12.0.2.2 0 100 0 i
* i 12.0.4.4 0 100 0 i
* 67.0.0.0/16 67.0.36.6 10000 0 67 i
*> 67.0.37.7 1000 0 67 i
